Alkene/excess maleic anhydride polymer manufacture

Details Alkene/excess maleic anhydride polymer manufacture Alkene/excess maleic anhydride polymer manufacture

1987-09-11

1989-08-22

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 88, 526272, C08F 200

Patent

active

048597520

ABSTRACT:
Disclosed is a method of making a polymer containing more than 50 to about 95 mole percent, preferably 65 to 80 mole percent, of units derived from maleic anhydride and the balance units derived from at least one 1-alkene. The method comprises mixing the maleic anhydride and 1-alkenes selected in the presence of a thermally decomposable initiator and, optionally, in the presence of a solvent at a temperature ranging between 145.degree. C. to 200.degree. C., in such a manner that throughout the process, the ratio of maleic anhydride to 1-alkenes is more than 50:50 to about 95:5, most preferably between 65:35 to 80:20, to form a reaction mixture and thereafter maintaining the reaction mixture at from 145.degree. C. to 200.degree. C. until a polymer containing more than 50 mole percent of maleic anhydride is obtained. In an alternative embodiment, the method further comprises preparing a precharge of maleic anhydride and the 1-alkenes selected in more than a 50:50 to about 95:5 molar ratio, heating the precharge to 145.degree. C. to 200.degree. C. and thereafter mixing the remaining reactants into the precharge.

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